{"id":44396,"date":"2023-04-25T14:55:49","date_gmt":"2023-04-25T19:55:49","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/what-is-an-ultrasonic-transducer\/"},"modified":"2025-01-21T07:28:44","modified_gmt":"2025-01-21T12:28:44","slug":"what-is-an-ultrasonic-transducer","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/vi\/what-is-an-ultrasonic-transducer\/","title":{"rendered":"Kh\u00e1m Ph\u00e1 B\u1ed9 Chuy\u1ec3n \u0110\u1ed5i Si\u00eau \u00c2m"},"content":{"rendered":"<p>Si\u00eau \u00e2m l\u00e0 s\u00f3ng \u00e2m c\u00f3 t\u1ea7n s\u1ed1 cao h\u01a1n ng\u01b0\u1ee1ng nghe c\u1ee7a con ng\u01b0\u1eddi, th\u01b0\u1eddng tr\u00ean 20kHz. \u0110\u1ec3 t\u1ea1o ra v\u00e0 thu nh\u1eadn s\u00f3ng si\u00eau \u00e2m, ch\u00fang ta c\u1ea7n m\u1ed9t thi\u1ebft b\u1ecb \u0111\u1eb7c bi\u1ec7t g\u1ecdi l\u00e0 \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m. V\u1eady \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m l\u00e0 g\u00ec v\u00e0 n\u00f3 ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o? B\u00e0i vi\u1ebft n\u00e0y s\u1ebd gi\u1ea3i th\u00edch chi ti\u1ebft v\u1ec1 c\u1ea5u t\u1ea1o, nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng v\u00e0 c\u00e1c \u1ee9ng d\u1ee5ng c\u1ee7a \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m.<\/p>\n<h3>C\u1ea5u t\u1ea1o c\u1ee7a \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m<\/h3>\n<p>\u0110\u1ea7u d\u00f2 si\u00eau \u00e2m th\u01b0\u1eddng \u0111\u01b0\u1ee3c ch\u1ebf t\u1ea1o d\u1ef1a tr\u00ean hi\u1ec7u \u1ee9ng \u00e1p \u0111i\u1ec7n.  Hi\u1ec7u \u1ee9ng n\u00e0y cho ph\u00e9p m\u1ed9t s\u1ed1 v\u1eadt li\u1ec7u nh\u1ea5t \u0111\u1ecbnh, v\u00ed d\u1ee5 nh\u01b0 g\u1ed1m \u00e1p \u0111i\u1ec7n (th\u01b0\u1eddng l\u00e0 PZT &#8211; Lead Zirconate Titanate), bi\u1ebfn \u0111\u1ed5i n\u0103ng l\u01b0\u1ee3ng \u0111i\u1ec7n th\u00e0nh n\u0103ng l\u01b0\u1ee3ng c\u01a1 h\u1ecdc d\u01b0\u1edbi d\u1ea1ng s\u00f3ng \u00e2m v\u00e0 ng\u01b0\u1ee3c l\u1ea1i.  M\u1ed9t \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m \u0111i\u1ec3n h\u00ecnh g\u1ed3m c\u00f3:<\/p>\n<ul>\n<li><strong>V\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n:<\/strong> \u0110\u00e2y l\u00e0 th\u00e0nh ph\u1ea7n c\u1ed1t l\u00f5i, ch\u1ecbu tr\u00e1ch nhi\u1ec7m t\u1ea1o ra v\u00e0 thu nh\u1eadn s\u00f3ng si\u00eau \u00e2m.<\/li>\n<li><strong>\u0110i\u1ec7n c\u1ef1c:<\/strong>  Hai l\u1edbp \u0111i\u1ec7n c\u1ef1c \u0111\u01b0\u1ee3c \u0111\u1eb7t \u1edf hai m\u1eb7t c\u1ee7a v\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n \u0111\u1ec3 t\u1ea1o ra \u0111i\u1ec7n tr\u01b0\u1eddng k\u00edch th\u00edch v\u1eadt li\u1ec7u dao \u0111\u1ed9ng.<\/li>\n<li><strong>L\u1edbp b\u1ea3o v\u1ec7:<\/strong>  L\u1edbp n\u00e0y b\u1ea3o v\u1ec7 v\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n kh\u1ecfi m\u00f4i tr\u01b0\u1eddng b\u00ean ngo\u00e0i v\u00e0 gi\u00fap truy\u1ec1n t\u1ea3i s\u00f3ng si\u00eau \u00e2m hi\u1ec7u qu\u1ea3.<\/li>\n<li><strong>\u0110\u1ebf \u0111\u1ee1:<\/strong> Cung c\u1ea5p s\u1ef1 \u1ed5n \u0111\u1ecbnh v\u00e0 h\u1ed7 tr\u1ee3 cho to\u00e0n b\u1ed9 c\u1ea5u tr\u00fac.<\/li>\n<li><strong>D\u00e2y d\u1eabn:<\/strong> D\u00f9ng \u0111\u1ec3 k\u1ebft n\u1ed1i \u0111\u1ea7u d\u00f2 v\u1edbi thi\u1ebft b\u1ecb t\u1ea1o t\u00edn hi\u1ec7u v\u00e0 x\u1eed l\u00fd t\u00edn hi\u1ec7u.<\/li>\n<\/ul>\n<h3>Nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng<\/h3>\n<p>Nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m d\u1ef1a tr\u00ean hi\u1ec7u \u1ee9ng \u00e1p \u0111i\u1ec7n. Khi m\u1ed9t \u0111i\u1ec7n \u00e1p xoay chi\u1ec1u \u0111\u01b0\u1ee3c \u0111\u1eb7t v\u00e0o hai \u0111i\u1ec7n c\u1ef1c, v\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n s\u1ebd dao \u0111\u1ed9ng v\u1edbi t\u1ea7n s\u1ed1 t\u01b0\u01a1ng \u1ee9ng, t\u1ea1o ra s\u00f3ng si\u00eau \u00e2m. Ng\u01b0\u1ee3c l\u1ea1i, khi s\u00f3ng si\u00eau \u00e2m t\u00e1c \u0111\u1ed9ng l\u00ean v\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n, n\u00f3 s\u1ebd t\u1ea1o ra m\u1ed9t \u0111i\u1ec7n \u00e1p xoay chi\u1ec1u, cho ph\u00e9p \u0111\u1ea7u d\u00f2 thu nh\u1eadn s\u00f3ng si\u00eau \u00e2m ph\u1ea3n x\u1ea1 t\u1eeb v\u1eadt th\u1ec3.<\/p>\n<h3>C\u00e1c lo\u1ea1i \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m<\/h3>\n<p>C\u00f3 nhi\u1ec1u lo\u1ea1i \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m kh\u00e1c nhau, \u0111\u01b0\u1ee3c ph\u00e2n lo\u1ea1i d\u1ef1a tr\u00ean t\u1ea7n s\u1ed1, h\u00ecnh d\u1ea1ng, v\u00e0 \u1ee9ng d\u1ee5ng. M\u1ed9t s\u1ed1 lo\u1ea1i ph\u1ed5 bi\u1ebfn bao g\u1ed3m:<\/p>\n<table class=\"table table-striped table-bordered\">\n<thead>\n<tr>\n<th>Lo\u1ea1i \u0111\u1ea7u d\u00f2<\/th>\n<th>T\u1ea7n s\u1ed1<\/th>\n<th>\u1ee8ng d\u1ee5ng<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u0110\u1ea7u d\u00f2 ti\u1ebfp x\u00fac<\/td>\n<td>1MHz &#8211; 10MHz<\/td>\n<td>Ki\u1ec3m tra khuy\u1ebft t\u1eadt v\u1eadt li\u1ec7u, \u0111o \u0111\u1ed9 d\u00e0y<\/td>\n<\/tr>\n<tr>\n<td>\u0110\u1ea7u d\u00f2 ch\u00ecm<\/td>\n<td>0.5MHz &#8211; 5MHz<\/td>\n<td>Ki\u1ec3m tra m\u1ed1i h\u00e0n, \u0111o \u0111\u1ed9 d\u00e0y trong m\u00f4i tr\u01b0\u1eddng n\u01b0\u1edbc<\/td>\n<\/tr>\n<tr>\n<td>\u0110\u1ea7u d\u00f2 m\u1ea3ng pha<\/td>\n<td>1MHz &#8211; 10MHz<\/td>\n<td>Ch\u1ea9n \u0111o\u00e1n h\u00ecnh \u1ea3nh y t\u1ebf<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>\u1ee8ng d\u1ee5ng c\u1ee7a \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m<\/h3>\n<p>\u0110\u1ea7u d\u00f2 si\u00eau \u00e2m \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng r\u1ed9ng r\u00e3i trong nhi\u1ec1u l\u0129nh v\u1ef1c kh\u00e1c nhau, bao g\u1ed3m:<\/p>\n<ul>\n<li><strong>Y t\u1ebf:<\/strong> Ch\u1ea9n \u0111o\u00e1n h\u00ecnh \u1ea3nh, \u0111i\u1ec1u tr\u1ecb ung th\u01b0, v\u1eadt l\u00fd tr\u1ecb li\u1ec7u.<\/li>\n<li><strong>C\u00f4ng nghi\u1ec7p:<\/strong> Ki\u1ec3m tra khuy\u1ebft t\u1eadt v\u1eadt li\u1ec7u, \u0111o \u0111\u1ed9 d\u00e0y, l\u00e0m s\u1ea1ch b\u1eb1ng si\u00eau \u00e2m.<\/li>\n<li><strong>\u0110o l\u01b0\u1eddng:<\/strong> \u0110o kho\u1ea3ng c\u00e1ch, \u0111o m\u1ee9c ch\u1ea5t l\u1ecfng.<\/li>\n<li><strong>\u00d4 t\u00f4:<\/strong> H\u1ec7 th\u1ed1ng h\u1ed7 tr\u1ee3 \u0111\u1ed7 xe.<\/li>\n<\/ul>\n<h3>C\u00e1c y\u1ebfu t\u1ed1 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u su\u1ea5t c\u1ee7a \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m<\/h3>\n<p>Hi\u1ec7u su\u1ea5t c\u1ee7a \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m ph\u1ee5 thu\u1ed9c v\u00e0o nhi\u1ec1u y\u1ebfu t\u1ed1, bao g\u1ed3m:<\/p>\n<ul>\n<li><strong>T\u1ea7n s\u1ed1:<\/strong> T\u1ea7n s\u1ed1 cao cho \u0111\u1ed9 ph\u00e2n gi\u1ea3i t\u1ed1t h\u01a1n nh\u01b0ng \u0111\u1ed9 xuy\u00ean th\u1ea5u k\u00e9m h\u01a1n.<\/li>\n<li><strong>K\u00edch th\u01b0\u1edbc:<\/strong> K\u00edch th\u01b0\u1edbc \u0111\u1ea7u d\u00f2 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn v\u00f9ng qu\u00e9t v\u00e0 \u0111\u1ed9 t\u1eadp trung c\u1ee7a ch\u00f9m tia si\u00eau \u00e2m.<\/li>\n<li><strong>V\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n:<\/strong>  C\u00e1c lo\u1ea1i v\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n kh\u00e1c nhau c\u00f3 c\u00e1c \u0111\u1eb7c t\u00ednh kh\u00e1c nhau.<\/li>\n<\/ul>\n<p>\u0110\u1ea7u d\u00f2 si\u00eau \u00e2m l\u00e0 m\u1ed9t thi\u1ebft b\u1ecb quan tr\u1ecdng trong nhi\u1ec1u \u1ee9ng d\u1ee5ng khoa h\u1ecdc v\u00e0 c\u00f4ng ngh\u1ec7. Hi\u1ec3u r\u00f5 v\u1ec1 nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng v\u00e0 c\u00e1c lo\u1ea1i \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m gi\u00fap ch\u00fang ta l\u1ef1a ch\u1ecdn v\u00e0 s\u1eed d\u1ee5ng thi\u1ebft b\u1ecb hi\u1ec7u qu\u1ea3 h\u01a1n. S\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a c\u00f4ng ngh\u1ec7 v\u1eadt li\u1ec7u v\u00e0 k\u1ef9 thu\u1eadt ch\u1ebf t\u1ea1o \u0111ang  ti\u1ebfp t\u1ee5c c\u1ea3i ti\u1ebfn hi\u1ec7u su\u1ea5t v\u00e0 m\u1edf r\u1ed9ng \u1ee9ng d\u1ee5ng c\u1ee7a \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m trong t\u01b0\u01a1ng lai.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Si\u00eau \u00e2m l\u00e0 s\u00f3ng \u00e2m c\u00f3 t\u1ea7n s\u1ed1 cao h\u01a1n ng\u01b0\u1ee1ng nghe c\u1ee7a con ng\u01b0\u1eddi, th\u01b0\u1eddng tr\u00ean 20kHz. \u0110\u1ec3 t\u1ea1o ra v\u00e0 thu nh\u1eadn s\u00f3ng si\u00eau \u00e2m, ch\u00fang ta c\u1ea7n m\u1ed9t thi\u1ebft b\u1ecb \u0111\u1eb7c bi\u1ec7t g\u1ecdi l\u00e0 \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m. V\u1eady \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m l\u00e0 g\u00ec v\u00e0 n\u00f3 ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o?<\/p>\n","protected":false},"author":1,"featured_media":19422,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6406],"tags":[],"class_list":["post-44396","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","prodpage-classic"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts\/44396","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/comments?post=44396"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts\/44396\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media\/19422"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media?parent=44396"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/categories?post=44396"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/tags?post=44396"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}